上一篇中，所有代码都是放在同一个文件main.h中的，这显然不是一个好的方式，代码多了以后，看着就头大。可以将其进行拆分：
1、将所有枚举、结构的定义单独放在一个文件ShapeDef.h中
//定义“几何形状类型”枚举
typedef enum
{
kCircle,
kRectangle,
kOblatesShperoid
} ShapeType;
//定义“几何形状颜色”枚举
typedef enum
{
kRedColor,
kGreenColor,
kBlueColor
} ShapeColor;
//定义“几何形状矩形区域”结构
typedef struct
{
int x,y,width,height;
} ShapeRect;
//定义“几何形状”结构
typedef struct
{
ShapeType type;
ShapeColor fillColor;
ShapeRect bounds;
}Shape;
2、将所有方法都放在另一个文件ShapeMethod.h中
#import "ShapeDef.h"
//将“颜色枚举“转换为字符串
NSString *colorName(ShapeColor colorName)
{
switch (colorName)
{
case kRedColor:
return @"red";
break;
case kGreenColor:
return @"green";
break;
case kBlueColor:
return @"blue";
default:
return @"no clue";
break;
}
}
//画圆
void drawCircle(ShapeRect bounds,ShapeColor fillColor)
{
NSLog(@"drawing a circle at (%d,%d,%d,%d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}//drawCircle
//画矩形
void drawRectangle(ShapeRect bounds,ShapeColor fillColor)
{
NSLog(@"drawing a rectangle at (%d,%d,%d,%d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}//drawRectangle
//画椭圆形
void drawEgg(ShapeRect bounds,ShapeColor fillColor)
{
NSLog(@"drawing an egg at (%d,%d,%d,%d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));
}//drawEgg
//画几何形状
void drawShapes(Shape shapes[],int count)
{
int i;
for(i=0;i<count;i++)
{
switch (shapes[i].type)
{
case kCircle:
drawCircle(shapes[i].bounds,shapes[i].fillColor);
break;
case kRectangle:
drawRectangle(shapes[i].bounds,shapes[i].fillColor);
break;
case kOblatesShperoid:
drawEgg(shapes[i].bounds,shapes[i].fillColor);
break;
default:
break;
}
}
}//drawShapes
3、最后在主文件Main.m中使用ShapeMethod.h
#import "ShapeMethod.h"
int main () {
Shape shapes[3];
ShapeRect rect0 ={0,0,10,30};
shapes[0].type = kCircle;
shapes[0].fillColor = kRedColor;
shapes[0].bounds = rect0;
ShapeRect rect1 = {30,40,50,60};
shapes[1].type = kRectangle;
shapes[1].fillColor = kGreenColor;
shapes[1].bounds = rect1;
ShapeRect rect2 = {15,18,37,39};
shapes[2].type = kOblatesShperoid;
shapes[2].fillColor = kBlueColor;
shapes[2].bounds = rect2;
drawShapes(shapes, 3);
return 0;
}
注：ShapeDef.h,ShapeMethod.h,Main.m三个文件均处于同一个项目的同一个目录中。
